Solar abundance of oxygen isotopes

Abstract

Oxygen in CAIs in primitive chondrites generally shows mass-independent isotopic fractionation. The self-shielding of CO has been proposed for this anomalous O-isotope. This process necessarily suggests that the CAI oxygen must be the same as the solar oxygen, and the planetary oxygen differ from the solar oxygen. With Bootstrap statistical examination of meteorite data, we show that the planetary oxygen must be the same as the solar oxygen, and hence the self-shielding hypothesis cannot be warranted.